JPH0679613B2 - Intraocular lens manufacturing method and manufacturing apparatus used therefor - Google Patents

Description

The present invention relates to a method for manufacturing an intraocular lens and a manufacturing apparatus used for the method. More specifically, the present invention relates to a manufacturing method and a manufacturing apparatus for inclining a loop of an intraocular lens and fixing it to the lens body.

[Prior Art] Conventionally, an intraocular lens has been widely used as a means for correcting visual acuity after extraction of a crystalline lens due to cataract.

By the way, the intraocular lens, as shown in FIGS.
When the back surface of the lens body (51) and the loop (52) are on the same plane, the iris (53) is contacted in the eye, which causes a problem of iris adhesion. Therefore 5a
As shown in Figs. 5c to 5c, the intraocular lens (5) in which the loop (52) is inclined and fixed with respect to the back surface of the lens body (51).
0) is used. Of course, in this intraocular lens, since the iris (53) and the lens body (51) are separated from each other, the problem of iris adhesion does not occur.

The conventional methods for producing an intraocular lens having an inclined loop as described above are roughly classified into the following two methods. The first is
A method of manufacturing a loop that is bent so as to have an inclination angle in advance and inserting it into the lens body and fixing it is the second method. First, the loop is fixed to the intraocular lens, and then the inclination angle is set to the loop. It is a method of bending so that it sticks.

[Problems to be Solved by the Invention] In any of the above-mentioned manufacturing methods, if the angles of loops symmetrically arranged with respect to the lens body are different, the stability of the lens in the eye deteriorates. The loop tilt angles should be approximately the same.

However, in the case of the first method, there is a problem that it is difficult to adjust the tilt angle. That is, it takes time and effort to match the inclination angles of both loops, whether the loops are inclined or fixed to the lens body. Further, as a method for fixing the loop and the lens, there are a method of fitting the loop into the hole of the lens body, a method of fixing with an adhesive, and a method of welding by laser irradiation as described in U.S. Pat. , The precision of the loop diameter and the hole diameter are severely required to manufacture, and the adhesive elutes into the eye. As shown in FIG. 6, a stopper (54) is attached to the insertion portion of the loop (52). Since it is used, there is a problem that its manufacture is difficult.

The second method is, for example, US Pat. No. 4,543,67.
Some are described in Japanese Patent Publication No. 3. As shown in FIG. 7, the holder (56) is placed on the intraocular lens (50) placed on the base (55), the cap (57) is attached, and the bolt (58) is tightened. After that, it is a method of putting it in a bath and heating it. However, this manufacturing method has a problem that the process is complicated because it has to be put in a bath.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a method and apparatus that can accurately and easily attach a tilt angle to a loop and fix the loop to a lens body.

[Means for Solving Problems] In the method for manufacturing an intraocular lens of the present invention, an intraocular lens in which a loop is inserted into a hole formed in a lens body in an unfixed state is inserted between a lower jig and an upper jig. The manufacturing method of the present invention is characterized in that the loop is held in a state of being inclined with respect to the lens body, and in that state, the loop of the portion inserted into the lens body is irradiated with a laser to weld the lens body and the loop. Is (a) a lens base that supports the lens body, a lower jig having a loop base that is inclined downward in the outer peripheral direction on the outer periphery of the lens base, and (b) is placed on the upper surface of the lower jig, An upper jig having an opening formed in a portion located above the lens base and a holding portion for holding the loop on the loop base is provided.

[Operation] According to the manufacturing method of the present invention, the loop has an inclination angle when it is sandwiched between the lower jig and the upper jig. Therefore, when the loop is welded to the lens body by laser irradiation, residual heat at that time is generated. Accurate tilt angle on loop.

Further, since the manufacturing apparatus of the present invention is provided with the loop base and the pressing portion that can give the loop a predetermined inclination angle by simply gripping the intraocular lens, the manufacturing method can be easily implemented.

[Examples] Next, examples of the present invention will be described.

FIG. 1 is an explanatory view showing a manufacturing method according to one embodiment of the present invention, FIG. 2 is a sectional view showing a manufacturing apparatus according to one embodiment of the present invention, and FIG. 3 is a lower portion shown in FIG. It is a perspective view of a jig.

First, a manufacturing apparatus (B) according to the present invention will be described with reference to FIGS. The manufacturing apparatus (B) of this embodiment includes a lower jig (1) and an upper jig (7).

The lower jig (1) is a columnar member having a low height, and has a lens base (3) at the center of the upper surface and a loop base (4) at its outer peripheral portion. The lens base (3) may be a recess that can stably support the lens body (2), but in this embodiment, the lens base (3) has substantially the same area as the lens body (2).
The diameter is about 5 to 7 mm, and the depth is the lens body (2).
The depth is such that they do not touch. Loop stand (4)
Is formed so as to incline downward toward the outer circumference, and its inclination angle (θ) is usually selected in the range of about 3 to 30 ° so as to be equal to the inclination angle given to the loop (14). Further, the loop base (4) may be inclined at least in a portion where the loop (14) is held. Therefore, the loop base (4) may be entirely inclined or partially inclined. Good.

The material of the lower jig (1) is not particularly limited, and the PMM
A, urethane resin, brass, etc. are used. Further, the shape is not limited to the illustrated cylindrical shape, and may be a hemispherical shape. The hemispherical case may have a spherical surface that fits the curve of the lens body (2).

A dowel pin (6) is preferably provided on the upper surface of the jig (1). If the alignment pin (6) is provided, the upper jig (7), which will be described later, can be easily and reliably aligned when it is stacked on the lower jig (1). The number, diameter, length, shape, etc. of the dowel pins (6) can be freely designed without any particular limitation as long as they can exert a positioning function.

A lens pin (8) may be provided on the lens base (3). The lens pin (8) is attached so that it can be inserted into an intra-eye alignment hole (9) formed in the lens body (2) of the intraocular lens (A). When such a lens pin (8) is provided, the lens body (2) can be easily set and placed in the lens base (3).
The lens pin (8) may be omitted, but when it is provided, two pins are preferable. Lens body (2) with one
It is difficult to set the position. The diameter of the lens pin (8) is made slightly smaller than the inner diameter of the alignment hole (9), and its length is preferably such that the tip is slightly slack from the lens body (2) when inserted into the alignment hole. . Further, it is preferable that the tip end is rounded so that the lens body (2) is not damaged during insertion.

As shown in the figure, the upper jig (7) is a disk-shaped member, and has an opening (10) formed in the center and a retainer (11) formed on the lower surface. The opening (10) is an opening required to irradiate a laser and is formed above the lens base (3) of the lower jig (1). The inner diameter is usually about 5 to 9 mm, but it is necessary to be larger than the diameter of the lens body (2). This opening (1
As shown in FIG. 2, it is preferable that the step (0) is provided with a step (15) so that it can be easily seen from above the lens body (2). Further, instead of forming the step portion (15), the inner peripheral surface of the opening portion (10) may be formed in a conical shape that spreads from the lower side to the upper side.

The holding portion (11) is formed so as to incline toward the outside in accordance with the loop base (4) of the lower jig (1). It is preferable to form a pin hole (12) in the upper jig (7). This pin hole (12) is a hole for inserting the dowel pin (6) of the lower jig (1) into the hole, and is formed at a position corresponding to the dowel pin (6) and with an inner diameter slightly larger than that. It If the pin hole (12) and the guide pin (6) have a guiding function, it is easy to correctly stack the upper jig (7) on the lower jig (1).

The material of the upper jig (7) is not particularly limited,
PMMA, urethane resin, brass, etc. are used, but if a material with a large specific gravity is used for brass, etc., simply stack it on the lower jig (1) and loop (1)
4) can be pressed onto the loop base (4), which is preferable.

If the elasticity of the loop (14) is strong, the loop (14) is hard to bend along the inclined surface of the loop base (14). Therefore, the weight of the upper jig (7) may be increased, or an appropriate means such as a screw may be used. ,Spring. The upper jig (7) may be pressed onto the lower jig (1) by using a means such as a magnet.

Next, the manufacturing method of the present invention will be described. In the case of manufacturing according to the present invention, the intraocular lens (A) is previously inserted with the loop (14) in an unfixed state in the hole formed in the lens body (2). The material of the lens body of the intraocular lens (A) is preferably PMMA, and the material of the loop (14) is preferably polyvinylidene fluoride, polypropylene, PMMA or the like. Further, the loop (14) may be transparent, but it is preferable that the loop (14) is colored because it easily absorbs the energy of the laser beam. It is preferable that the relationship between the hole diameter and the loop diameter of the lens body (2) is substantially equal. If the pore size is too large, the loop (14) will fall off or move easily, and if the pore size is too small, it will be difficult to insert the loop (14).

As the laser device for melting the loop (14), either a pulsed laser or a continuous laser can be used. Since the laser beam should not melt and damage the lens body (2) even if the loop (14) is melted, the wavelength that can be transmitted through the lens body (2) is selected from the range of about 0.25 to 5.0 μm. Preferred types of laser are YAG laser (wavelength 1.06 μm) and argon ion laser (wavelength 0.
45 to 0.53 μm).

Table 1 shows the preferable range of energy supplied by the laser. If the energy is too large, the lens body (2) will be melted, and if it is too small, the loop (14) will not be melted. The output and irradiation time shown in Table 1 may be selected as appropriate values within a range not exceeding the preferable energy range.

At the time of manufacturing, as shown in FIG. 1, the intraocular lens (A) is placed on the lower jig (1), and the upper jig (7) is placed thereon. When the intraocular lens (A) is placed and guided by using the lens pin (8) and the alignment hole (9) in the lens body (2), the lens body (2) can be easily attached to the lens base (3). Can be centered.
Also, when placing the upper jig (7), by guiding it with the dowel pin (6) and the pin hole (12) in the upper jig (7), the upper jig (7) can be correctly positioned on the lower jig (1). Can be adjusted to

In the above state, the loop (14) is pressed onto the loop base (4) by the presser section (11), and at the same angle as the inclination angle (θ) of the loop base (1) with respect to the lens body (2). Can be angled.

Next, the laser device (13) is brought close to the opening (10), and the loop (14) is inserted into the lens body (2) in an unfixed state.
Irradiate the insertion part of the laser. After irradiation for a predetermined time, the loop (14) is melted and welded to the lens body (2). After welding, the loop (14) is allowed to cool as it is until the temperature of the loop (14) is lowered, but the time is generally about 5 seconds. When the loop (14) is surely welded to the lens body (2), the upper jig (7) may be removed and the intraocular lens (A) may be taken out.

As described above, according to the present invention, since the inclination angle of the loop (14) is restrained by the jig during welding, the loop (14) does not get out of order between the symmetrical loops (14), and it is possible to simply slide it with the jig. Good, easy to work with.

[Effects of the Invention] According to the present invention, the following effects can be achieved.

It is easy to attach the loop to the lens body at an angle, and the angle of inclination can be accurately set.

Strict accuracy is not required for the loop diameter and the hole diameter formed in the lens body, so that the manufacturing is easy.

Since no adhesive is used, it is highly safe in the eye.

No need for complicated steps such as putting in a bathtub.

Does not require loop stops that are difficult to manufacture.

Since the outer surface of the lens body is not uneven due to laser irradiation, post-processing such as polishing is unnecessary.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing method according to one embodiment of the present invention, FIG. 2 is a sectional view of a manufacturing apparatus according to one embodiment of the present invention, and FIG. 3 is a lower jig shown in FIG. Perspective view of
FIGS. 4a to 4c are a front view, a side view and an intraocular insertion state explanatory view of a conventional intraocular lens, and FIGS. 5a to 5c are front views, side views and eyes of an intraocular lens of the type manufactured by the present invention. FIG. 6 and FIG. 7 are explanatory views showing a conventional manufacturing method, in which the inner insertion state is illustrated. (Main symbols in the drawing) (1): Lower jig (2): Lens body (3): Lens stand (4): Loop stand (7): Upper jig (10): Opening part (11): Pressing part (13) ): Laser device (14): Loop

Claims (2)

[Claims] 1. An intraocular lens having a loop inserted into a hole formed in a lens body in an unfixed state is sandwiched between a lower jig and an upper jig to hold the loop in an inclined state with respect to the lens body. A method for manufacturing an intraocular lens, which comprises irradiating a laser on a loop inserted in the lens body to weld the loop to the lens body. 2. A lens base for supporting a lens body,
A lower jig having a loop base that is inclined downward in the outer peripheral direction on the outer peripheral portion of the lens base, and (b) an opening formed on the upper surface of the lower jig and positioned above the lens base. An apparatus for manufacturing an intraocular lens, comprising: a portion; and an upper jig having a holding portion for holding the loop on the loop base.